English
The mapMatrix of a linear equivalence equals the mapMatrix of its inverse: f.mapMatrix.symm = (f.symm.mapMatrix).
Русский
Картограмма отображения матрицы равна отображению обратного отображения: f.mapMatrix.symm = (f.symm.mapMatrix).
LaTeX
$$$f.mapMatrix.symm = (f.symm.mapMatrix)$$$
Lean4
/-- The `LinearEquiv` between spaces of matrices induced by a `LinearEquiv` between their
coefficients. This is `Matrix.map` as a `LinearEquiv`. -/
@[simps apply]
def mapMatrix (f : α ≃ₛₗ[σᵣₛ] β) : Matrix m n α ≃ₛₗ[σᵣₛ] Matrix m n β :=
{ f.toEquiv.mapMatrix,
f.toLinearMap.mapMatrix with
toFun := fun M => M.map f
invFun := fun M => M.map f.symm }